Experimental Analysis, Modeling, and Control of Volumetric Radial-Piston Pumps

2011 ◽  
Vol 133 (8) ◽  
Author(s):  
Andrea E. Catania ◽  
Alessandro Ferrari
Keyword(s):  
Flow Rate ◽  
Fuel Injection ◽  
Characteristic Curve ◽  
Control Valve ◽  
Pressure Control ◽  
Specific Reference ◽  
Modeling And Control ◽  
Capacity Curves ◽  
Diesel Fuel Injection ◽  
Pressure Control Valve

An experimental-theoretical study has been carried out on high-pressure volumetric radial-piston pumps for diesel fuel injection systems. The dependence of the pump inducted flow rate on speed and load was investigated and the characteristic curve of the pump cooling-lubrication circuit was derived. The head-capacity curves were determined for different types of pumps at different revolution speeds and compared with the injector flow requirements in order to evaluate the pressure-control strategy efficiency. An insight into the ageing effects on the pump performance was also provided. Furthermore, the dynamic pump behavior was investigated, with specific reference to the flow-rate ripple at the delivery port. A general analytical expression has been derived for the volumetric efficiency. Furthermore, a specific procedure has been developed and applied to the experimental evaluation of the fuel leakages in pressure control valve (PCV) integrated pumps. Finally, the mechanical-hydraulic efficiency of the pump has experimentally been assessed as a function of head and speed in order to obtain a reliable evaluation of the pump shaft power and torque at different working conditions.

scholarly journals Comparison of Flow-Dependent Controllers for Remote Real-Time Pressure Control in a Water Distribution System with Stochastic Consumption

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 422 ◽  
Author(s):  
Philip Page ◽  
Enrico Creaco
Keyword(s):  
Real Time ◽  
Flow Rate ◽  
Stochastic Demand ◽  
Control Valve ◽  
Pressure Control ◽  
Variable Pressure ◽  
Consumption Pattern ◽  
Numerical Comparison ◽  
Critical Node ◽  
Pressure Control Valve

The control of pressure at a remote critical node using a pressure control valve is a highly effective way to attain pressure management. To perform real-time control, various kinds of controllers can be used, including flow-dependent controllers. These controllers calculate valve setting adjustment based both on the deviation of the pressure from the set-point and on the flow rate at the valve site. After putting all the flow-dependent controllers present in the scientific literature within the same framework, this paper presents a numerical comparison of their performance under realistic conditions of stochastic demand. Two controllers were selected for the comparison, namely the simple LCF (parameter-less proportional controller with known constant pressure control valve flow); and LVF (parameter-less controller with known variable pressure control valve flow), which uses a flow rate forecast. Indeed, this study considered an upgrade of LVF, in which the flow rate forecast was tailored to the conditions of stochastic demand. The application in a specific example network proved the performance of these controllers to be quite similar, although LCF was preferable due to its simple structure. For LCF, the average pressure at the critical node had a clear relationship to the consumption pattern. LVF outperformed when the hourly variation dominates the fluctuations in the flow. The conditions under which this out-performance occurred are comprehensively discussed.

scholarly journals The Miller tracheal cuff pressure control valve.

Anaesthesia ◽  
1993 ◽  
Vol 48 (4) ◽  
pp. 324-327 ◽  
Author(s):  
K. A. PAYNE ◽  
D. M. MILLER
Keyword(s):  
Cuff Pressure ◽  
Control Valve ◽  
Pressure Control ◽  
Pressure Control Valve ◽  
Tracheal Cuff

Suction Pressure Control Valve for Microneurosurgery

2020 ◽  
Vol 68 (3) ◽  
pp. 652
Author(s):  
DeepakK Jha ◽  
AbhijeetS Barath ◽  
OmP Thakur ◽  
Mayank Garg ◽  
Suryanarayanan Bhaskar
Keyword(s):  
Control Valve ◽  
Pressure Control ◽  
Suction Pressure ◽  
Pressure Control Valve

Modelling and Reducing Fuel Flow Pulsation of a Fuel-Metering System by Improving Response of the Pressure Control Valve During Pump Mode Switching in a Turbofan Engine

2019 ◽  
Author(s):  
Seiei Masuda ◽  
Fumio Shimizu ◽  
Masaki Fuchiwaki ◽  
Kazuhiro Tanaka
Keyword(s):  
Control Valve ◽  
Flow Region ◽  
Pressure Control ◽  
Low Flow ◽  
Mode Switching ◽  
Pump Mode ◽  
Turbofan Engine ◽  
Fuel Pump ◽  
Fuel Flow ◽  
Pressure Control Valve

Abstract In an aircraft turbofan engine, a fuel metering unit meters and supplies the required fuel to the engine according to the flight situation. When a centrifugal fuel pump (CFP) is used as the fuel pump, the ratio of hydraulic power per weight can be increased by raising the rated rotational speed, so the weight of the fuel pump can be decreased compared to when using a gear pump (GFP). There is an advantage that it can be reduced significantly. However, since the operating range of the fuel pump is wide, it is not effective to use CFP in an extremely low flow rate region because the fuel temperature rises due to its PQ characteristics and a large loss. Therefore, it is considered effective to combine CFP and GFP as pressure sources, and to use GFP in the low flow region and CFP in the high flow region. For that purpose, it is necessary to have a pump mode switching mechanism. The disadvantage in this case is that changing the pump mode causes a large pressure change of the fuel pressure source, which in turn causes fuel flow pulsations. There are three possible ways to solve this problem. The first method is to keep the differential pressure control valve (DPCV) unit response constant, which keeps the metering valve differential pressure constant in FMS. A second method is to remove high frequency components that the DPCV cannot follow pressure changes in the fuel control system. A third method is to keep the pressure difference between the two fuel sources small and to reduce the amplitude of the applied disturbance. In this paper, the first method, which makes DPCV response high response, is verified by modeling and simulation, and its effectiveness is confirmed.

scholarly journals Influence of Coolant Pressure Size on Surface Roughness when Stainless Steel Machining

2019 ◽  
Vol 299 ◽  
pp. 04002
Author(s):  
Robert Cep ◽  
Lenka Cepova ◽  
Cristina Stefana Borzan ◽  
Jiri Kasal ◽  
Marek Sadilek ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Pressure ◽  
Stainless Steel ◽  
Control Valve ◽  
Pressure Control ◽  
Optical Microscope ◽  
Contact Method ◽  
External Cooling ◽  
Pressure Control Valve ◽  
Valve Housing

The paper is focused on the influence of the coolant pressure on the surface roughness of the workpiece when machining stainless steels. The components were machined on a STAR SR-32J dual spindle machining center and an external cooling unit HYTEK CHAV 160/150-AF-F-OL was used for cooling. Two stainless steel components were investigated, namely the gas control valve rod and the high-pressure control valve housing, which require low roughness Ra after machining (less than 0.375 and 0.25 micrometers respectively). The first component was tested at 8 different pressures in the range of 150 bar - 10 bar and the second component at 4 different pressures in the range of 120 bar - 10 bar. The roughness parameters were measured by the contact method using the MITUTOYO Surftest SJ-410 Roughness Tester and the Alicona InfiniteFocus optical microscope. Based on these sample input parameters, it was evaluated howmuch the pressure affects the surface quality or suggested its reduction due to the high cost of operation of the external high-pressure equipment.

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